Window balancing

A quick learner from Denver says:
Part # show (01/3) UNIQUE 27-B-20, but measure show 29, which one should I order? Thanks for the help
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Tom from SWISCO responded:

I'm seeing Series 795 here, but you need to measure the width of that T shoe.

As for the length, measure just the metal channel. I wouldn't be surprised if it turned out to be 28".

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